I hope you found what you needed as I am new to the party here but it is my understanding that 2010-2014 any 3.7 motor/exhaust parts will fit. Its only the front end that changed for a face lift.
I just wanted to say hello. I have a 2012 Base Mustang that has some modifications done to it, namely the Procharger. I will poke around some on the forums some looking to see others builds.